packer {
  required_version = ">= 1.9.0"
  required_plugins {
    vsphere = {
      source  = "github.com/hashicorp/vsphere"
      version = "~> 1"
    }
  }
}

# ── vCenter connection ───────────────────────────────────────────────────────

variable "vcenter_server" {
  type        = string
  description = "vCenter server hostname or IP address"
}

variable "vcenter_username" {
  type        = string
  description = "vCenter username (e.g. administrator@vsphere.local)"
}

variable "vcenter_password" {
  type        = string
  description = "vCenter password"
  sensitive   = true
}

variable "vcenter_insecure_connection" {
  type        = bool
  description = "Skip TLS certificate verification (set false in production)"
  default     = true
}

# ── vSphere placement ────────────────────────────────────────────────────────

variable "datacenter" {
  type        = string
  description = "vSphere datacenter name"
}

variable "cluster" {
  type        = string
  description = "vSphere cluster or standalone ESXi host name"
}

variable "datastore" {
  type        = string
  description = "Datastore name where the VM will be stored"
}

variable "network" {
  type        = string
  description = "Port group / network name (used for Packer SSH — not saved in template)"
}

variable "vm_folder" {
  type        = string
  description = "VM inventory folder path (empty = root datacenter folder)"
  default     = ""
}

# ── VM hardware ──────────────────────────────────────────────────────────────

variable "vm_name" {
  type        = string
  description = "Name of the resulting VM template"
  default     = "debian-13-gui-template"
}

variable "vm_cpus" {
  type        = number
  description = "Number of vCPUs"
  default     = 2
}

variable "vm_memory_mb" {
  type        = number
  description = "RAM in MB"
  default     = 2048
}

variable "vm_disk_size_mb" {
  type        = number
  description = "System disk size in MB"
  default     = 40960 # 40 GB
}

# ── ISO paths on the vSphere datastore ──────────────────────────────────────
# Format: "[<datastore-name>] <folder/filename.iso>"
# All five BDs are mounted simultaneously so apt can resolve packages from any
# disc without manual disc swapping.  BD-1 is the only bootable disc.

variable "iso_bd1" {
  type        = string
  description = "Datastore path to debian-13-amd64-BD-1.iso  (bootable installer)"
}

variable "iso_bd2" {
  type        = string
  description = "Datastore path to debian-13-amd64-BD-2.iso"
}

variable "iso_bd3" {
  type        = string
  description = "Datastore path to debian-13-amd64-BD-3.iso"
}

variable "iso_bd4" {
  type        = string
  description = "Datastore path to debian-13-amd64-BD-4.iso"
}

variable "iso_bd5" {
  type        = string
  description = "Datastore path to debian-13-amd64-BD-5.iso"
}

variable "iso_bd6" {
  type        = string
  description = "Datastore path to debian-13-amd64-BD-6.iso"
}


# ── Preseed / SSH credentials ────────────────────────────────────────────────
# Must match the values in http/preseed.cfg

variable "ssh_username" {
  type    = string
  default = "root"
}

variable "ssh_password" {
  type      = string
  sensitive = true
  default   = "packer"
}

# ── Source definition ────────────────────────────────────────────────────────

source "vsphere-iso" "debian" {
  # vCenter
  vcenter_server      = var.vcenter_server
  username            = var.vcenter_username
  password            = var.vcenter_password
  insecure_connection = var.vcenter_insecure_connection
  datacenter          = var.datacenter
  cluster             = var.cluster
  datastore           = var.datastore
  folder              = var.vm_folder

  # VM identity
  vm_name       = var.vm_name
  guest_os_type = "debian10_64Guest" # highest Debian guest ID recognised by ESXi 6.5
  notes         = "Debian 13 (Trixie) — built with Packer on ${formatdate("YYYY-MM-DD", timestamp())}"

  firmware = "efi"

  # CPU / RAM
  CPUs            = var.vm_cpus
  RAM             = var.vm_memory_mb
  RAM_reserve_all = false

  # Disk — thin-provisioned on a PVSCSI controller (best practice for vSphere)
  disk_controller_type = ["pvscsi"]
  storage {
    disk_size             = var.vm_disk_size_mb
    disk_thin_provisioned = true
    disk_controller_index = 0
  }

  # Network adapter — needed only so Packer can SSH in after install.
  # The preseed does not write any persistent network configuration.
  network_adapters {
    network      = var.network
    network_card = "vmxnet3"
  }

  # SATA CD-ROM drives — SATA supports up to 30 slots, avoiding the 4-device
  # IDE limit.  All five BD ISOs are mounted simultaneously so apt-cdrom can
  # scan every disc without manual swapping.
  cdrom_type = "sata"
  iso_paths = [
    var.iso_bd1, # CD-ROM 0 — bootable installer disc
    var.iso_bd2, # CD-ROM 1
    var.iso_bd3, # CD-ROM 2
    var.iso_bd4, # CD-ROM 3
    var.iso_bd5, # CD-ROM 4
    var.iso_bd6, # CD-ROM 5
  ]

  # Packer starts a local HTTP server to serve the preseed file.
  http_directory = "${path.root}/http"
  http_port_min  = 8100
  http_port_max  = 8199

  # Boot sequence (UEFI / GRUB edit mode):
  #   1. Wait for the GRUB menu to appear.
  #   2. Press down once — default is "Graphical install"; one down selects
  #      the plain "Install" (TUI) entry.
  #   3. Press 'e' to open the entry editor.
  #   4. Navigate down to the linux kernel line (3rd line in the entry) and
  #      jump to its end, then append preseed parameters.
  #   5. Press Ctrl+X to boot.
  boot_wait = "10s"
  boot_command = [
    "<down><wait>",
    "e<wait2>",
    "<down><down><down><end>",
    " auto=true priority=critical",
    " locale=en_US.UTF-8",
    " keymap=us",
    " keyboard-configuration/xkb-keymap=us",
    " keyboard-configuration/layoutcode=us",
    " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/preseed.cfg",
    "<wait><leftCtrlOn>x<leftCtrlOff>"
  ]

  # SSH communicator — Packer waits here until the VM finishes installing,
  # reboots, and becomes reachable (open-vm-tools reports the DHCP address).
  communicator           = "ssh"
  ssh_username           = var.ssh_username
  ssh_password           = var.ssh_password
  ssh_timeout            = "120m"
  ssh_handshake_attempts = 100

  # Keep the five CD-ROM drives in the template so the discs can be remounted
  # later (e.g. to install additional packages on cloned VMs).
  # ISOs remain attached; disconnect them in the vSphere UI if not needed.
  remove_cdrom = false

  # Power off and convert to template once the build completes
  convert_to_template = false
  create_snapshot     = true
  snapshot_name       = "Start"
}

# ── Build ─────────────────────────────────────────────────────────────────────

build {
  name    = "debian-13-gui-template"
  sources = ["source.vsphere-iso.debian"]

  # Install VS Code + YAML extension and Zeal docsets (requires internet via DHCP)
  provisioner "shell" {
    inline = [
      "set -e",
      # BDs are mounted at boot via fstab (installer keeps trays closed via
      # cdrom-detect/eject=false in preseed).
      "for n in 1 2 3 4 5 6; do mountpoint -q /mnt/bd$n || mount /mnt/bd$n; done",
      "sudo apt-get update",
      # ── VS Code ─────────────────────────────────────────────────────────────
      # Download the .deb directly — avoids apt-get update hitting stale CD-ROM sources
      "curl -fL --retry 3 'https://code.visualstudio.com/sha/download?build=stable&os=linux-deb-x64' -o /tmp/vscode.deb",
      "file /tmp/vscode.deb | grep -q 'Debian binary package' || { echo 'VS Code download is not a valid .deb'; head -c 500 /tmp/vscode.deb; exit 1; }",
      "dpkg -i /tmp/vscode.deb || apt-get install -fy",
      "rm -f /tmp/vscode.deb",
      "code --install-extension redhat.vscode-yaml --no-sandbox --user-data-dir /root/.vscode --force",

      # Patch the .desktop launcher so VS Code opens without the root sandbox error
      "sed -i 's|Exec=/usr/share/code/code|Exec=/usr/share/code/code --no-sandbox|g' /usr/share/applications/code.desktop",

      # ── Zeal ────────────────────────────────────────────────────────────────
      "apt-get install -y zeal",
      # Qt WebEngine (Chromium) refuses to run as root without disabling sandbox.
      # Patch the launcher to pass the env var instead of --no-sandbox flag.
      "sed -i 's|^Exec=zeal|Exec=env QTWEBENGINE_CHROMIUM_FLAGS=--no-sandbox zeal|' /usr/share/applications/org.zealdocs.zeal.desktop",
      "mkdir -p /root/.local/share/Zeal/Zeal/docsets",
      "wget -qO /tmp/Python.tgz  https://kapeli.com/feeds/Python.tgz  && tar -xz -C /root/.local/share/Zeal/Zeal/docsets -f /tmp/Python.tgz  && rm /tmp/Python.tgz",
      "wget -qO /tmp/Ansible.tgz https://kapeli.com/feeds/Ansible.tgz && tar -xz -C /root/.local/share/Zeal/Zeal/docsets -f /tmp/Ansible.tgz && rm /tmp/Ansible.tgz",
      "wget -qO /tmp/Nginx.tgz   https://kapeli.com/feeds/Nginx.tgz   && tar -xz -C /root/.local/share/Zeal/Zeal/docsets -f /tmp/Nginx.tgz   && rm /tmp/Nginx.tgz",
      "wget -qO /tmp/Bash.tgz    https://kapeli.com/feeds/Bash.tgz    && tar -xz -C /root/.local/share/Zeal/Zeal/docsets -f /tmp/Bash.tgz    && rm /tmp/Bash.tgz",
    ]
  }

  # Generalise the VM so every clone starts with a clean identity
  provisioner "shell" {
    inline = [
      # Remove SSH host keys — regenerated on first boot of each clone
      "sudo rm -f /etc/ssh/ssh_host_*",

      # Generate root SSH key
      "sudo mkdir -p /root/.ssh",
      "sudo chmod 700 /root/.ssh",
      "sudo ssh-keygen -t ed25519 -N '' -f /root/.ssh/id_ed25519",
      "sudo chmod 600 /root/.ssh/id_ed25519",
      "sudo chmod 644 /root/.ssh/id_ed25519.pub",
      "sudo cp /root/.ssh/id_ed25519.pub /root/.ssh/authorized_keys",
      "sudo chmod 600 /root/.ssh/authorized_keys",

      # Clear machine-id — systemd and DHCP clients use it as a unique identifier
      "sudo truncate -s0 /etc/machine-id",
      "sudo rm -f /var/lib/dbus/machine-id",
      "sudo ln -s /etc/machine-id /var/lib/dbus/machine-id",

      # Network left as DHCP — no wipe needed for GUI template
      "sudo rm -f /etc/udev/rules.d/70-persistent-net.rules",
      "sudo truncate -s0 /etc/hostname",

      # ── cloud-init ──────────────────────────────────────────────────────────
      # Set VMware as the preferred datasource (open-vm-tools is installed)
      "echo 'datasource_list: [VMware, NoCloud, None]' | sudo tee /etc/cloud/cloud.cfg.d/99-datasource.cfg",

      # Remove any cloud-init state so it runs fresh on first boot of each clone
      # Services are enabled automatically by the package — no explicit enable needed
      "sudo cloud-init clean --logs",

      # ── Cleanup ─────────────────────────────────────────────────────────────
      # Clean apt package cache
      "sudo apt-get clean -y",
      "sudo apt-get autoremove --purge -y",

      # Truncate log files (keep the files so rsyslog doesn't complain)
      "sudo find /var/log -type f | sudo xargs truncate -s0",
      "sudo truncate -s0 /var/log/wtmp",
      "sudo truncate -s0 /var/log/lastlog",

      # Clear shell histories
      "sudo truncate -s0 /root/.bash_history",
      "truncate -s0 ~/.bash_history",
    ]
  }
}